1. The problem statement, all variables and given/known data a roof makes an angle of 30deg with the horizontal. A ball rools off the edge at a speed of 5.0 m/s. The distance to the ground is 7meters. How long is the ball in the air? 2. Relevant equations 0=Vot-1/2gt^2+y t=(vo+/- sqrt(vo^2-(4*gy)))/g 3. The attempt at a solution 0=.5*(-9.81)(sin(30))*t^2 + 5t + 7 from quadratic equation I get t=.468 but it should be .97 seconds. I tried using cos(30) instead and I got 2.0 seconds. Please point out what I am doing wrong. Thanks!